4155985 has 16 divisors (see below), whose sum is σ = 5287680. Its totient is φ = 3129280.

The previous prime is 4155929. The next prime is 4155989. The reversal of 4155985 is 5895514.

It is not a de Polignac number, because 4155985 - 2⁷ = 4155857 is a prime.

It is a super-2 number, since 2×4155985² = 34544422640450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4155989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7911 + ... + 8419.

It is an arithmetic number, because the mean of its divisors is an integer number (330480).

Almost surely, 2^4155985 is an apocalyptic number.

It is an amenable number.

4155985 is a deficient number, since it is larger than the sum of its proper divisors (1131695).

4155985 is a wasteful number, since it uses less digits than its factorization.

4155985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its digits is 36000, while the sum is 37.

The square root of 4155985 is about 2038.6233099815. The cubic root of 4155985 is about 160.7772726185. Note that the first 3 decimals are identical.

It can be divided in two parts, 415 and 5985, that added together give a square (6400 = 80²).

The spelling of 4155985 in words is "four million, one hundred fifty-five thousand, nine hundred eighty-five".